如图1,锐角
内接于
,
为
的中点,连结
并延长交
于点
,连结
,
,过
作
的垂线交
于点
,点
在
上,连结
,
,若
平分
且
.
的度数.
(2)①求证:
.
②若
,求
的值.
(3)如图2,当点
恰好在
上且
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29f9f4fb55def567f40a93a87f466c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a01eac79ff7ca76aebf5543199f223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec412ebd940d71b983ce4877e3401ee.png)
(2)①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4474c82ae786e175b5e603b81bc8018d.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b832a541b0c06d650c0cd10b176226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90df0af645b7f0286d501b9f83fe3b7f.png)
(3)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e563312ccec5351634ed0a3bf4c984f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
2024九年级下·全国·专题练习 查看更多[1]
(已下线)重难点05 圆的综合压轴题(6大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(全国通用)
更新时间:2024-04-25 08:35:09
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】(1)如图1,在锐角
中,分别以
为边向外作等腰
和等腰
,使
,
,
,连接
,
.求证:
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966352202031104/2972136022245376/STEM/989ac192b49949ddbe7cd49d513d744a.png?resizew=479)
(2)如图2,在
中,
,D为
上一点,连接
,作
,
,连接
,若
,求四边形
的面积.
(3)如图3,在四边形
中,已知
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13258c1759b48eda989a806092f2472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4760b2ea8943686bf14817f8c887926e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966352202031104/2972136022245376/STEM/989ac192b49949ddbe7cd49d513d744a.png?resizew=479)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c698adfe03ba12297e2da79d7f811bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2190970b1e2e397896d445b4138fe34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea542c31170157c0e9b9e8b65a95437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945e93c9f3515ded840de09a9ba81ce8.png)
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0d85c2d46f2b134e2577d0544e1539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图1,在矩形
中,点E是边
上的一点,连接
.
(1)若
平分
,点G是
上的一点,连接
,
,且
.过点C作
于
,
延长线交
于H,过点H作
于P,如图.
①填空:
的形状是______三角形;
②求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b35debc1a8052ce224e5e0dfd82c95.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/4db72622-2840-485f-b41e-8c8683e4b493.png?resizew=244)
(2)将图1的矩形
画在纸上,若
平分
,沿过点E的直线折叠,点C恰好落在
上的点
处,点B落在点
处,得到折痕
,
交
于点
,如图.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/82f13419-e77e-4433-bd18-478d4dd23afa.png?resizew=140)
(3)如图,延长
交
的延长线于点K使得
,此时恰好
,连接
交
于点J,连接
.
请证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7323063875e0cbb55eef1791a1dccddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af3e66b008ae109d4fbce51da360dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9ce06b68b176fed0049cb1206f9ed6.png)
①填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b35debc1a8052ce224e5e0dfd82c95.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/4db72622-2840-485f-b41e-8c8683e4b493.png?resizew=244)
(2)将图1的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28a8256ad6594075095668c2c8e02f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/82f13419-e77e-4433-bd18-478d4dd23afa.png?resizew=140)
(3)如图,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4690e2dc4e8a95c451f75fbacf788c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2588559c01596b7d95c3431ce2d14d1.png)
请证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e34da68b0bf5f8ebcd701313b2a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/4ffdd94b-b602-4f87-940f-67f9f3962302.png?resizew=191)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
解题方法
【推荐3】阅读材料:等腰三角形具有性质“等边对等角”.事实上,不等边三角形也具有类似性质“大边对大角”:如图1.在△ABC中,如果AB>AC,那么∠ACB>∠ABC.证明如下:将AB沿△ABC的角平分线AD翻折(如图2),因为AB>AC,所以点B落在AC的延长线上的点B'处.于是,由∠ACB>∠B',∠ABC=∠B',可得∠ACB>∠ABC.
(1)灵活运用:从上面的证法可以看出,折纸常常能为证明一个命题提供思路和方法.由此小明想到可用类似方法证明“大角对大边”:如图3.在△ABC中,如果∠ACB>∠ABC,那么AB>AC.小明的思路是:沿BC的垂直平分线翻折……请你帮助小明完成后面的证明过程.
(2)拓展延伸:请运用上述方法或结论解决如下问题:
如图4,已知M为正方形ABCD的边CD上一点(不含端点),连接AM并延长,交BC的延长线于点N.求证:AM+AN>2BD.
(1)灵活运用:从上面的证法可以看出,折纸常常能为证明一个命题提供思路和方法.由此小明想到可用类似方法证明“大角对大边”:如图3.在△ABC中,如果∠ACB>∠ABC,那么AB>AC.小明的思路是:沿BC的垂直平分线翻折……请你帮助小明完成后面的证明过程.
(2)拓展延伸:请运用上述方法或结论解决如下问题:
如图4,已知M为正方形ABCD的边CD上一点(不含端点),连接AM并延长,交BC的延长线于点N.求证:AM+AN>2BD.
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466217348276224/2466941026091008/STEM/1c4e4553e1d243ff94f26f7d1d4199b6.png?resizew=482)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】已知:在
中,
,
,且点
,
分别在矩形
的边
,
上.
(1)如图
,当点
在
上时,求证:
;
(2)如图
,若
是
的中点,
与
相交于点
,连接
,求证:
;
(3)如图
,若
,
,
分别交
于点
,
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9f4fe60b81ff21ca2acc95848a643d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196ad60e8803f1c27fb8f1c584824ab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/8d0ce5c9-1cb1-4322-960c-dc825c211708.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/87856e13-e9da-46e9-b7ad-40570252af86.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/c20a2ec0-2e95-4344-87dd-5ed134bc2b54.png?resizew=172)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637036d26c56bacaa700595eca3f37a8.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fda5d3bec762fcbc9f450be383b05c.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a216a515262c356fc0fd017da627e3.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,已知:抛物线
交x轴于A、C两点,交y轴于B.且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/69c8146e-2151-4704-adec-f748e254fc2d.png?resizew=151)
(1)求点A、B、C的坐标及二次函数解析式;
(2)在直线AB上方的抛物线上有动点E.作EG⊥x轴交x轴于点G,交AB于点D,作EF⊥AB于点F.若点D的横坐标为m求线段EF的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/1647eb6f-fa4d-44b7-ad47-bf5c57edc2dc.png?resizew=152)
(3)抛物线对称轴上是否存在点P使得△ABP为以AB为直角边的直角三角形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d89057bac47a9d19b74b34a5fffd9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a082c093c94217fc69894a0b09daa4e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/69c8146e-2151-4704-adec-f748e254fc2d.png?resizew=151)
(1)求点A、B、C的坐标及二次函数解析式;
(2)在直线AB上方的抛物线上有动点E.作EG⊥x轴交x轴于点G,交AB于点D,作EF⊥AB于点F.若点D的横坐标为m求线段EF的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/1647eb6f-fa4d-44b7-ad47-bf5c57edc2dc.png?resizew=152)
(3)抛物线对称轴上是否存在点P使得△ABP为以AB为直角边的直角三角形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
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解答题-问答题
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较难
(0.4)
【推荐1】如图,
是
的外接圆,
为直径,
下方的半圆上找点D,使得
(保留作图痕迹,不写作法);
(2)在(1)所作的图中,连接
,
,
.已知
,
,
①求四边形
的面积;
②求O到弦
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b997b0da1c9338e640206bfc0d0a427a.png)
(2)在(1)所作的图中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01571ba9e67d681d38907c8087ae6266.png)
①求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
②求O到弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-证明题
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较难
(0.4)
真题
解题方法
【推荐2】某数学兴趣小组在数学课外活动中,对多边形内两要互相垂直的线段做了如下探究:
【观察与猜想】
(1)如图1,在正方形
中,点
,
分别是
,
上的两点,连接
,
,
,则
的值为__________;
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/c576b71f-59c5-4b0f-8ccf-9c95dabf474c.png)
(2)如图2,在矩形
中,
,
,点
是
上的一点,连接
,
,且
,则
的值为__________;
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/da23abcb-b53a-42b2-88b3-9d9e77419af2.png)
【类比探究】
(3)如图3,在四边形
中,
,点
为
上一点,连接
,过点
作
的垂线交
的延长线于点
,交
的延长线于点
,求证:
;
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/84396462-e021-4e7d-b8a1-badc271ffe6f.png)
【拓展延伸】
(4)如图4,在
中,
,
,
,将
沿
翻折,点
落在点
处得
,点
,
分别在边
,
上,连接
,
,且
.
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/d9f4bdf6-b0aa-41da-8b1d-05002ab36add.png)
①求
的值;
②连接
,若
,直接写出
的长度.
【观察与猜想】
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/c576b71f-59c5-4b0f-8ccf-9c95dabf474c.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/da23abcb-b53a-42b2-88b3-9d9e77419af2.png)
【类比探究】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb545c1a90c841d0d25070cf62b64e3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/84396462-e021-4e7d-b8a1-badc271ffe6f.png)
【拓展延伸】
(4)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f127f0bc607d4ace53a6c5157612e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53289e3083b05d556dd30197abc547ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88a11128d8f44ccc4f3d1cfdd7a9291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/d9f4bdf6-b0aa-41da-8b1d-05002ab36add.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图在矩形ABCD中,AB=8,过对角线AC的中点O作直线PE,交AB于点P,交CD于点Q,交射线AD于点E,连接CE,作点Q关于CE对称的对称点Q′,以Q′为圆心,为CQ′半径作⊙Q′,交CE于点M,设BC=x.
(1)请说明△AOP≌△COQ的理由.
(2)若AP=5,
①请用x的代数式表示DE的长.
②当△DQM为直角三角形时,请求出所有满足条件的BC的值.
(3)若存在⊙Q′同时与直线AC和直线AD相切,请直接写出⊙Q′的半径.
(1)请说明△AOP≌△COQ的理由.
(2)若AP=5,
①请用x的代数式表示DE的长.
②当△DQM为直角三角形时,请求出所有满足条件的BC的值.
(3)若存在⊙Q′同时与直线AC和直线AD相切,请直接写出⊙Q′的半径.
![](https://img.xkw.com/dksih/QBM/2019/5/16/2204772086923264/2209626643841024/STEM/59eca46d2d004108a5b0634d3390cfc4.png?resizew=158)
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解答题-问答题
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较难
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,AB=10,BC=6,点O在射线AC上(点O不与点A重合),过点O作OD⊥AB,垂足为D,以点O为圆心,OD为半径画半圆O,分别交射线AC于E,F两点,设OD=x.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/9093aca1-b428-49f5-a175-7d4239a270b7.png?resizew=355)
(1)如图1,当点O为AC边的中点时,则x= ;
(2)如图2,当点O与点C重合时,连接DF,求弦DF的长;
(3)若半圆O与BC无交点,则x的取值范围是 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/9093aca1-b428-49f5-a175-7d4239a270b7.png?resizew=355)
(1)如图1,当点O为AC边的中点时,则x= ;
(2)如图2,当点O与点C重合时,连接DF,求弦DF的长;
(3)若半圆O与BC无交点,则x的取值范围是 .
您最近一年使用:0次